Year Kilotonnes
1850 0
1851 0.00002
1852 0.00005
1853 0.00007
1854 0.0001
1855 0.00012
1856 0.00014
1857 0.00017
1858 0.00019
1859 0.00021
1860 0.00024
1861 0.00026
1862 0.00029
1863 0.00031
1864 0.00033
1865 0.00036
1866 0.00038
1867 0.00041
1868 0.00043
1869 0.00045
1870 0.00048
1871 0.0005
1872 0.00053
1873 0.00055
1874 0.00057
1875 0.0006
1876 0.00062
1877 0.00065
1878 0.00067
1879 0.0007
1880 0.00072
1881 0.00111
1882 0.0015
1883 0.00189
1884 0.00228
1885 0.00267
1886 0.00306
1887 0.00346
1888 0.00385
1889 0.00424
1890 0.00464
1891 0.00485
1892 0.00501
1893 0.00511
1894 0.00514
1895 0.0051
1896 0.00727
1897 0.00943
1898 0.01157
1899 0.0139
1900 0.01616
1901 0.01938
1902 0.03021
1903 0.04257
1904 0.07274
1905 0.06628
1906 0.07684
1907 0.09142
1908 0.102
1909 0.1085
1910 0.1122
1911 0.12
1912 0.1509
1913 0.1719
1914 0.1348
1915 0.1007
1916 0.1681
1917 0.1573
1918 0.142
1919 0.108
1920 0.2161
1921 0.3241
1922 0.4322
1923 0.5402
1924 0.6483
1925 0.7563
1926 0.8644
1927 0.9724
1928 2.031
1929 2.615
1930 2.615
1931 2.593
1932 2.636
1933 2.485
1934 22.26
1935 79.18
1936 86.68
1937 91.95
1938 92.88
1939 85.64
1940 54.33
1941 33.81
1942 56
1943 78.98
1944 88.76
1945 98.17
1946 97.86
1947 97.38
1948 70.29
1949 80.96
1950 8.703
1951 12.1
1952 11.22
1953 13.83
1954 16.84
1955 18.18
1956 29.27
1957 25.6
1958 28.2
1959 29.02
1960 29.22
1961 29.27
1962 28.87
1963 29.81
1964 27.08
1965 29.82
1966 52.83
1967 26.05
1968 35.74
1969 36.89
1970 32.22
1971 35.21
1972 34.41
1973 41.69
1974 59.2
1975 91.88
1976 78.8
1977 90.25
1978 84.87
1979 96.26
1980 98.02
1981 99.46
1982 91.12
1983 153.6
1984 144.4
1985 128
1986 129
1987 160.3
1988 231.1
1989 213.8
1990 181.7
1991 184.8
1992 187.9
1993 191.1
1994 194.4
1995 197.7
1996 201
1997 204.4
1998 207.9
1999 211.4
2000 215